Why is grout turning brown?
Why is grout turning brown? Because grout is porous, it absorbs dirt and moisture, making it a breeding ground for bacteria in steamy bathrooms. "When it turns from pink to brown or black, the mould is already inside the grout," says Mr. Quecano. "So the only way to really fix the problem is to re-grout. How do you keep grout from turning brown? Fill a spray bottle three-quarters full with undiluted, distilled white vinegar. Spray the stained grout with the vinegar. Let the vinegar soak in for five to 10 minutes so it penetrates the grout. Scrub the grout with...